Fix MAVEN_GOALS and MAVEN_OPTS not getting replaced

Also use the Wiki Page's recommendations for MAVEN_GOALS and MAVEN_OPTS
default values.

https://wiki.opendaylight.org/view/GettingStarted:Jenkins_Verify_Job_Setup

Change-Id: I73aaac72931c3221dd98d73abef547b507eb55d6
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>